Lamp



FIG. 1 is a perspective view of a lamp illustrating the new design.

FIG. 2 is a top view of the new design.

FIG. 3 is a front elevational view of the new design.

FIG. 4 is a side elevational view of the new design.

FIG. 5 is a back elevational view of the new design.

FIG. 6 is a bottom view of the new design. 

The ornamental design for a lamp, substantially as shown. 